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Alum
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Meaning
Noun
●
An
astringent
salt
, usually
occurring
in the form of
pale
crystals
, much used in the
dyeing
and
tanning
trade
and in certain
medicines
, and now
understood
to be a double
sulphate
of
potassium
and
aluminium
(K₂SO₄·Al₂(SO₄)₃·24H₂O).
●
In Chemistry:
Any
similar
double
sulphate
in which either or both of the
potassium
and
aluminium
is
wholly
or
partly
replaced
by other
univalent
or
tervalent
cations.
●
In American English, Canadian English & People:
A
past
attendee
or
graduate
(of either
gender
) of a
college
,
university
or other
educational
institution.
Verb
●
To
steep
in, or otherwise
impregnate
with, a
solution
of
alum
; to
treat
with
alum
.
Sourced from
Wiktionary
Origin
alum
English
alum
Anglo-Norman
Sourced from
Etym
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